Yes...there are at least five instances that make me ashamed of my country's foreign policy:
1.) Throwing Chiang Kai Shek to the dogs after WWII.
2.) Bay of Pigs
3.) Leaving South Vietnam without support after we pulled out.
4.) Treatment of the Shah of Iran.
5.) Inciting Shiites to rebellion under Saddam Hussein, then turning our backs on them when they did.
I would like to make one other addition to the shame list, Carter selling out Free China (Taiwan) to the commies.